Lock hold-back latch



Filed Dec. 8, 1958 /2 Jan. 15, 1963 C. L. EADS LOCK HOLD-BACK LATCH 2 Sheets-Sheet l amws z. 5405,

INVENTOR.

fiw nah/qu Jan. 15, 1963 c. L. EADS LOCK HOLD-BACK LATCH 2 Sheets-Sheet 2 Filed Dec. 8, 1958 7 m 5 fi m L Z l U WAR? 5\ 2 I 2 INV NTOR.

L/ WW Mr A m M4 M; m 1 a w M 5 W M Patented Ja 15 3,tl73,143 LOCK HOLD-BACK LATCH Charles L. Eads, North Hollywood, (Ialifi, assignor to Adams Rite Manufacturing Company, Glendale, Calif., a corporation of California Filed Dec. 8, 1958, Ser. No. 778,918 7 Claims. (Cl. 7il-151) The present invention relates generally to lock and latch mechanisms, and is more particularly concerned with lock mechanisms of the type wherein a spring actuated bolt may be deadlocked in locked position, and manually latched in unlocked position.

Heretofore, conventional lock mechanisms of this type have been relatively complicated in that they embodied complex arrangements utilizing a multiplicity of parts,

and the bolt could be latched in unlocked position by anyone.

With this in mind, the present invention has for one object the provision of the above described type lock which will have relatively few and simple parts, and wherein the lock bolt may be latched in unlocked posi-' tion by means of suitable key controlled mechanism, thus making it possible for authorized personnel only. to set the locking bolt in unlocked position.

A-further object of the present invention is to provide in a lock mechanism of the herein described character, a

single member carried by the bolt means, this member being arranged to perform a multiplicity of functions in a plurality of operations of the lock parts. For example, a single locking lever is carried by the bolt, this lever serving (1) in cooperation with the key controlled means to move the bolt to retracted position; (2) to move a holdback latch member to released position, when the bolt is moved to retracted position, (3) to cooperate with the hold-back latch to retain the bolt in unlocked position, when the hold-back latch is moved by the key controlled means to a latching position, and (4) in cooperation with a deadlock actuator to lock the bolt in locked extended position.

Still another object of the invention is to provide an improved bolt and deadlock actuator which may be reversed to accommodate the lock for right-hand and lefthand closing doors, the associated parts of the bolt and deadlock actuator being so arranged that they may be changed as to their mounting, depending upon which direction of door closing is selected.

Further objects of the invention will be brought out in the following part of the specification, wherein detailed description is for the purpose of fully disclosing the invention without placing limitations thereon.

Referring to the accompanying drawings, which are for illustrative purposes only:

FIG. 1 is a perspective view of a lock mechanism embodying the features of the present invention, and an associated door jamb of conventional construction;

FIG. 2 is a sectional view, taken substantially on line 22 of FIG. 1, showing the cooperative relationship of the lock components, the bolt and deadlock actuator being in extended positions;

FIG. 3 is a view similar to FIG. 2, except that deadlock actuator is shown in retracted position, and the bolt is locked in extended position;

FIG. 4 is a fragmentary View showing the cooperative relationship between the hold-back latch and the key controlled actuating means; and

FIGS. 5A and 5B are views schematically showing the bolt and deadlock actuator and the manner in which the cooperably associated parts may be changed depending upon whether it is desired to use the lock on a righthand or left-hand closing door.

Referring more specifically to the drawins trative purposes there is disclosed in FIG. 1 ing which is designated generally by th numeral m This casing comprises a pair of side plates 11 and 1i which are secured in spaced apart relation by means of upper and lower brackets 13 and 14, these brackets eeing secured by appropriate conventional means to the side plates and respectively provided with right angled end portions 15-15 for a face plate 16 which may be attached thereto as by screws 17-17. This face plate is formed with a rectangular opening 18 within which a bolt structure 199 is movable to retracted and extended positions. Immediately below the opening 13 is a second opening 2% in the face plate within which there is reciprocably mounted a deadlock actuator 21, this actuator being likewise movable to retracted and extended positions in a manner similar to the bolt 19.

The bolt 19 in its locked or extended position is adapted to enter into a suitable opening 22 formed in a strike plate 23 of a jamb or another door 24. The actuator 21, however, is so positioned that it will strike against the strike plate below the opening 22, when the door is in closed position, the deadlock actuator thereby being moved to its retracted position, and through this independent movement acting through mechanism which will be more fully described subsequently to deadlock the bolt 19 in its locked position.

More specifically, the bolt 1% comprises a solid body member 25 of generally rectangular cross section. The outermost end of the body member is formed with a bevelled end face 26 which provides a camming surface adapted to cooperate with the door jamb to force the bolt inwardly towards its retracted position, when the door is closed. The opposite end of the body 25 is provided with a vertical end opening slot 27 which results in the formation at this end of spaced wall portions 28 and 29 which have inner end terminations in reduced end portions 30 and 31 which provide upper and lower notches 32 and 33 respectively. The inner surfaces of the wall portions 28 and 29 are provided with central arcuate grooves 3434, as seen best in FIGS. 5A and 5B, which are adapted to form a seat for one end of a compression coiled spring 35. The bolt 19 is positioned in the casing, as shown best in FIG. 2, for reciprocable movement between the side plates 11 and 12, this movement being guided by means of laterally extending pins 3636 carried by the contracted portions 30 and 31, respectively, these pins extending outwardly into longitudinal guide slots 37 respectively formed in each of the side plates 11 and 12. As thus mounted, the other end of spring 35 bears against a removably secured retaining plate 38, the spring 35 thus acting to normally bias the bolt 19 towards its extended position.

The deadlock actuator, as best shown in FIGS. 2, 5A and 5B comprises a body member 39 of substantially rectangular cross section, but of less height than the body 25 of the bolt. In a similar manner, the outermost end of the body 39 is provided with a bevelled end face 40 which provides a cam surface for coacting with the door jamb and the strike plate 23 to force the deadlock actuator in a direction towards its retracted position. The innermost end of the body 39 is formed with an end opening slot 41 which results in the formation at this end of spaced wall portions 42 and 43. The inner surfaces of these wall portions are formed with longitudinally extending arcuate wall surfaces or grooves 44 which form a seat for one end of a coiled compression spring 45. The wall portions 42 and 43 are also provided with laterally extending pins 46 which extend into guide slots 47 respectively formed in the side plates 11 and 12. The deadlock actuator is thus supported for reciprocable movement, and the spring 45 by virtue of having its outerlock cas.

for illusmost end bearing against the retaining plate 38 will act to normally bias the actuator 21 in a direction towards its extended position, as shown in FIG. 2.

Mounted within the slot 27 of the bolt structure 19 is a locking member 48 having angularly positioned arms 49 and 50, this locking member being pivoted at the juncture of the arms on a pivot pin 51 for rocking movement. As clearly shown in 'FIG. 2, the arm 50 of the locking member extends in a vertical direction along the bottom of the slot.27, while the arm 49 extends longitudinally of the slot along its upper portion. The outermost end of the arm 49 is provided with laterally extending pins 52 which extend outwardly into elongate horizontal guide slots 53 respectively formed in the side plates 11 and 12 of the casing. The innermost ends of the guide slots 53 terminate in an offset notch 54 into which the adjacent pin 52 is adapted to move, when the bolt 19 is in extended position and the locking member 48 is rotated in a clockwise direction. In this positicn, the bolt 19 is dead-locked against movement to its retracted position. The locking member 48 is normally biased for movement in a clockwise direction by a small coiled compression spring 55 having one end seated in'the bottom of the slot 27, and its other end bearing against the adjacently disposed arm 50 of the locking member. Moreover, the outermost end of the arm 49 is deflected to form an upwardly extending hook 56 having an inclined surface 57 for a purpose which will subsequently be explained in detail.

The deadlock actuator, adjacent the bottom of its end opening slot 41 carries an upstanding screw stud 58, the outermost end of which extends into the bottom portion of slot 27 of the bolt structure, and in the extended position of the actuator 21 normally bears against the outermost end of the arm 50 so as to oppose clockwise rotation of the locking member by the action of spring 55. However, when the door is closed, as shown in FIG. 3, and the deadlock actuator is moved to its retracted position due to its outer end engaging the strike plate, the screw stud 58 will be moved away from the arm 50 and thus permit the spring 55 to rotate the locking member to a position in which the pins 52 will enter the adjacent ofiset notches 54 and deadlock the bolt 19 against movement towards its retracted position.

For actuating the bolt 19 and the associated deadlock actuator 21 to a retracted position, when unlocking the door so that it may be opened, various types of manually operable mechanisms may be used. In the present instance the casing side plates 11 and 12 are respectively provided with a threaded opening 59 in each case which is positioned above the bolt structure for the mounting therein of a conventional key actuated lock cylinder 69 which carries a rotatable member 61 having a cam extension 62. It will be observed that the center of rotation of the member 61 is such that the cam extension upon being rotated in a clockwise direction, as shown in FIG. 3, will engage against the hook 56, and that as clockwise rotation is continued will move the pins 52 out of their respective notches 54. Further movement of the cam extension will now operate to carry the bolt 19 to its retracted position, thus permitting opening movement of the door. In the retracted position of the bolt 19, the screw stud 58 will again bear against the arm 59 and retain the deadlock actuator in its retracted position until the key actuated cam extension is released, whereupon the springs 35 and 47 will act to restore both the bolt 19 and the actuator 21 to their extended positions as shown in FIG. 2.

As a further feature of the lock mechanism of the present invention, means are further provided for the utilization of the key control lock cylinder and its cam extension for opearting a hold-back latch for retaining the bolt 19 in a retracted position so that the door will not be locked when moved to a closed position. The utilization of a key for this purpose enables only authorized personnel being able to place the locked bolt in an unlocked position. For this purpose, there is provided an L-shaped hold-back latch member 63 as shown in FIG. 1, this member having an arm 64 which supports the member for swinging movement on a pivot pin 65. The other arm of the latch member, as indicated by the numeral 66, extends outwardly at substantially right angles to the arm 64 to a position where it may latchingly cooperate with the hook portion 56 of the locking member 48. A stop pin 67 limits the clockwise movement of the latch member 63.

Referring now to FIG. 4, it will be observed that when the bolt 19 is manually moved to its fully retracted position, the hook 56 is carried to a position wherein the latch member 63 may be moved into latching position, with the arm 66 serving as a retainer, by rotating the cam extension 62 in a counterclockwise direction until it bears against the arm 66 of the latch member. Further movement of the cam extension causes the latch member arm 66 to move into a retaining position with respect to the In the'even't that the arm 64 of the latch member should be against the stop pin 67, when the bolt 19 is moved to its retracted position, the inclined end surface 57 will have a camming action against the arm 66 to etlect sufficient counterclockwise movement of the latch member to carry it way from the stop pin 67 and permit full retracted movement of the bolt 19. The cam extension may be then utilized to move the latch member to a latching position over the hook 56 as previously explained.

With bolt 19 in latched retracted position, as shown in FIG. 4, the latch member may be moved to a released 'position by actuating the key cylinder mechanism in a direction to move the cam extension clockwise to a position shown in dotted lines where it will engage the arm 66 and upon further movement carry the arm to a released position with respect to the hook 56. Upon releasing the actuating force applied by the key, the bolt 19 will more under its spring action to its extended position.

The construction of the bolt 19 and the deadlock actuator 21 together with the locking member 48 mounting and the screw stud 58 mounting are so arranged that the parts are easily and readily reversibel to accommodate the lock mechanism for right-hand and left-hand closing doors. This reversibility is shown in FIGS. 5A and 513. With the parts arranged as shown in 5A, the lock assembly will be as indicated in FIG. 2 and FIG. 3. However, if it is desired to reverse the closing direction, this may be readily accomplished by securing the screw stud 58 to the body 39 so that it is in a depending position rather than an upstanding position. In the case of the body member 2'5 of the bolt 19, the locking member 48 is inverted so that the hook 56 projects downwardly rather than upwardly. In this position, the pivot pin 51 is shifted to the position 51' where it is supported in appropriate openings in the walls 28 and 29. As thus assembled the parts will appear as shown in SE. Each part as it is now placed in its position in the casing should be inverted so as to place the screw stud 58 in an upstandmg position, and the body 25 inverted so as to place the hook 56 in an upwardly extending direction. The direction of the cam surfaces 26 and 44 will then be properly disposed for the desired reversed closing direction of the door.

From the foregoing description, it is believed that it will be readily apparent that the lock structure of the present invention will accomplish the objections as hereinbefore noted.

Various modifications may suggest themselves to those skilled in the art without departing from the spirit of my invention, and, hence, I do not wish to be restricted to the specific form shown or uses mentioned, except to the extent indicated in the appended claims.

I claim:

1. A door lock including a casing, a latch bolt slidable in said casing between projected and retracted positions, an operating lever rotatably carried by said casing and having a free end portion adapted to retract said latch bolt, an auxiliary bolt slidable in said casing and movable relatively to said latch bolt between projected and depressed positions, a projection on said auxiliary bolt, an abutment on said casing, a dogging member pivotally mounted on said latch bolt and having a detent portion engageable with said abutment to dog the latch bolt in projected position, a spring acting between the latch bolt and said dogging member biasing said dogging member into dogging position, a separate spring urging said auxiliary bolt into projected position, said separate spring being of sufficient strength to overcome the force of the springacting'on said dogging member, said dogging member having a portion lying in the path of the projection on said auxiliary bolt and a separate portion lyingin the path of the free end of said operating lever, said projection being engageable with said portion of the dogging member when the auxiliary bolt is projected to retain said dogging member in undogging position and being disengaged from said portion when the auxiliary bolt is depressed thereby permitting said dogging member to assume its dogging position, the free end of said operating lever being movable into engagement with said separate portion of the dogging member to move said dogging member out of dogging position and thereafter moving said latch bolt to retracted position.

2. In a locking mechanism for a door, the combination comprising: a casing structure; a latch bolt movable in the casing structure between retracted and extended positions; a locking member; means journaling the locking member on the bolt for rocking movement; said locking member having a first arm extending in one direction and a second arm extending in another direction outwardly from the journaling means; an actuator bolt movable in the casing structure between retracted and extended positions; means for biasing the actuator bolt and the latch bolt toward their extended positions; said actuator bolt having a projection thereon; said first arm extending in position to be engaged by the projection on the actuator bolt; guide means on the casing structure for engaging a portion of the second arm for deadlocking said second arm when the latch bolt is in its extended position; means for biasing said second arm into deadlocked position; and key controlled means for engaging a portion of said locking member to move said second arm out of deadlocking position and to retract said latch bolt.

3. In a locking mechanism for a door, the combination comprising: a casing structure; a latch bolt movable in the casing structure between retracted and extended positions; a locking member; means journaling the locking member on the bolt. for rocking movement; said locking member having a. first arm extending in one direction and a second arm extending in another direction outwardly from the journaling means; an actuator bolt movable in the casing structure between retracted and extended positions; means for biasing the actuator bolt and the latch bolt toward their extended positions; said actuator bolt having a projection thereon; said first arm extending in position to be engaged by the projection on the actuator bolt; said casing having a slot extending adjacent the path of movement of the latch bolt and an offset notch .in the slot; means on the second arm for engaging in the slot; said offset notch being positioned in the slot to receive the second arm engaging means when the latch bolt is in its extended position; means for biasing said second arm into said offset notch; and key controlled means for engaging a portion of said locking member to move said second arm out of said notch and to retract said latch bolt.

4. In a locking mechanism for a door, the combination comprising: a casing structure; a latch bolt movable in a path in the casing structure between retracted and extended positions; a locking member; means journaling the locking member on the bolt adjacent one side thereof; said locking member having a first arm extending outwardly from the journaling means transversely of the path of movement of the latch bolt and a second arm extending outwardly from the journaling means lengthwise of the path of movement of the latch bolt; an actuator bolt movable in the casing structure between retracted and extended positions; means for biasing the actuator bolt and the latch bolt toward their extended positions; said actuator bolt having a projection thereon, said first arm extending in position to be engaged by the projection on the actuator bolt; guide means on the casing structure for engaging a portion of the second arm for deadlocking said second arm when the latch bolt is in its extended position; means for biasing said second arm into deadlocked position; and key controlled means for engaging a portion of said locking member to move said second arm out of deadlocking position and to retract said latch bolt.

5. In a locking mechanism for a door, the combination comprising: a casing structure having a face plate; a latch bolt movable in a path in said casing structure between a retracted position within said casing structure and an extended position projecting through an opening in said face plate, said bolt having a beveled camming face at its outer end and having a slot in said latch bolt extending transversely of the path of movement of the latch bolt; a locking member; plural bearing means in the slot adjacent opposite ends of said slot, means journaling the locking member in one of said bearing means for rocking movement; said locking member having a first arm extending in the slot outwardly from the journaling means substantially transversely of the path of movement of said latch bolt; a second arm extending in the slot outwardly from the journaling means along the path of movement of the latch bolt; an actuator bolt movable in the casing between retracted and extended positions; said actuator bolt having a projection thereon; said first arm extending in position to be engaged by the projection on the actuator bolt; guide means on the casing structure for engaging a portion of the second arm for deadlocking said second arm when the latch bolt is in its extended position; means for biasing said second arm into deadlocked position; and key controlled means for engaging a portion of said locking member to move said second arm out of deadlocking position and to retract said latch bolt whereby the locking member is journaled selectively in one of the bearing means for orienting the camming face of the bolt for right or left hand latching.

6. In a locking mechanism for a door, the combination comprising: a casing structure; a latch bolt movable in the casing structure between retracted and extended positions; a locking member; means journaling the locking member on the bolt for rocking movement; said locking member having a first arm extending in one direction and a second arm extending in another direction outwardly from the journaling means; an actuator bolt movable in the casing structure between retracted and extended positions; means for biasing the actuator bolt and the latch bolt toward their extended positions; said actuator bolt having a projection thereon; said first arm extending in position to be engaged by the projection on the actuator bolt; guide means on the casing structure for engaging a portion of the second arm and deadlocking said second arm when the latch bolt is in its extended position; means for biasing said second arm into deadlocked position; bolt hold back means on the casing for engaging the locking member; and key controlled means selectively for engaging a portion of the locking member to retract the latch bolt and for operating the bolt hold back means to keep the bolt in retracted position.

7. In a locking mechanism for a door, the combination comprising: a casing structure; a latch bolt movable in the casing structure between retracted and extended positions; a locking member; means journaling the locking member on the bolt forrocking movement; said locking member having a first arm extending in one direction and a second arm extending in another direction outwardly from the journaling means; an actuator bolt movable in the casing structure between retracted and extended positions; means for biasing the actuator bolt and the latch bolt toward their extended positions; said actuator bolt having a projection thereon; said first arm extending in position to be engaged by the projection on the actuator bolt; guide means on the casing structure for engaging a portion of the second arm and deadloeking said second arm when the latch bolt is in its extended position; means for biasing said second arm into deadlocked position; said second arm having a hook thereon; a bolt hold back latch member mounted on the casing in position for swinging movement into and out of overlapping relation with said hook when the latch bolt is retracted; and key controlled means operable selectively for engaging the hook to move the second arm out of deadlocking position and to retract the latch bolt, and to swing said bolt hold back latch member into and out of overlapping relation with the hook /hen the latch bolt is retracted.

References Cited in'th'e fil'eof this patent UNiTED STATES PATENTS 332,976 Veit Dec. 22, 1885 1,163,725 Hurd Jan. '18, 1916 1,241,787 VOight Oct. 2, 1917 1,262,878 VOight Apr. 16, 1918 1,608,869 Prelle' NOV. 30, 1926 1,697,569 Knowles Ian. 1, 1929 1,876,080 schlage Sept. 6, 1932 2,516,991 Heyer Aug. 1, 1950 2,591,647 Welch Apr. 1, 1952 2,661,972 Schlage Dec. 8, 1953 2,836,051 Walters May 27, 195 8 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No, 3 ,O73 l43 January 15, 1963 Charles L, Eads It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 3 line 27 after "inclined" insert end line 71;, for "opearting' read operating column 4; line 42, for "reversibeP read reversible --g line 66 for "objections" read objects n Signed and sealed this 3rd day of September 1963.,

(SEAL) Attest:

ERNEST w. SWIDEB. DAVID LADD Attesting Officer Commissioner of Patents 

2. IN A LOCKING MECHANISM FOR A DOOR, THE COMBINATION COMPRISING: A CASING STRUCTURE; A LATCH BOLT MOVABLE IN THE CASING STRUCTURE BETWEEN RETRACTED AND EXTENDED POSITIONS; A LOCKING MEMBER; MEANS JOURNALING THE LOCKING MEMBER ON THE BOLT FOR ROCKING MOVEMENT; SAID LOCKING MEMBER HAVING A FIRST ARM EXTENDING IN ONE DIRECTION AND A SECOND ARM EXTENDING IN ANOTHER DIRECTION OUTWARDLY FROM THE JOURNALING MEANS; AN ACTUATOR BOLT MOVABLE IN THE CASING STRUCTURE BETWEEN RETRACTED AND EXTENDED POSITIONS; MEANS FOR BIASING THE ACTUATOR BOLT AND THE LATCH BOLT TOWARD THEIR EXTENDED POSITIONS; SAID ACTUATOR BOLT HAVING A PROJECTION THEREON; SAID FIRST ARM EXTENDING IN POSITION TO BE ENGAGED BY THE PROJECTION ON THE ACTUATOR BOLT; GUIDE MEANS ON THE CASING STRUCTURE FOR ENGAGING A PORTION OF THE SECOND ARM FOR DEADLOCKING SAID SECOND ARM WHEN THE LATCH BOLT IS IN ITS EXTENDED POSITION; MEANS FOR BIASING SAID SECOND ARM INTO DEADLOCKED POSITION; AND KEY CONTROLLED MEANS FOR ENGAGING A PORTION OF SAID LOCKING MEMBER TO MOVE SAID SECOND ARM OUT OF DEADLOCKING POSITION AND TO RETRACT SAID LATCH BOLT. 